46 ZOOLOGY OF THE VOYAGE OF THE SULPHUR. 



Testa coniformi, hyalina, nitida ; spira valde retusa ; labro paululiirn incrassato et reflexo, intus lsevi ; 

 columella plicis quatuor gracilibus. 



Inhab. West coast of Africa. 



187. Marginella fusiformis, Hinds, Proceed. Zool. Soc. 1844, March, (Plate XIII, fig. 20, 

 21.) Testa, fusiformi, albida vel pallide cornea; spira elata, obtusa ; anfractu ultimo gradatim 

 attenuato ; labro paululum incrassato, intus lsevi ; apertura lineari ; columella quadriplicate. 



Inhab. Straits of Malacca ; in seventeen fathoms, mud. 



This species departs so far from the usual outline of the genus, as to become 

 decidedly fusiform. The recent shell is most probably of a delicate horn colour, 

 though the prevailing number of our specimens are white, shining, and glassy, 

 and there seems little doubt that these have lost their original colour. 



Section II. Cryptospira. 



188. Marginella tricincta, Hinds, Proceed. Zool. Soc. 1844, March, (Plate XII, fig. 12, 13.) 

 Testa obeso-ovata, cinereo ccerulente, fusco trifasciata ; labro incrassato, luteo, intus lsevi ; columella 

 sexplicata, ad basin alba. ; plicis tribus superioribus transversis ; suprema paululum obsoleta. 



Inhab. Straits of Macassar; in eleven fathoms, coarse sand. 



A fine species very typical of this section, and distinguished by its three 

 dark girdling bands. Of the six folds which are supported by the columella, the 

 three, and perhaps also four, superior are horizontal, whilst those inferior become 

 oblique. The highest fold is not so boldly produced as the others, and is some- 

 what removed from them. It is worthy of remark that most of the species from 

 the above locality have more than four folds on the columella. 



189. Marginella blanda, Hinds, Proceed. Zool. Soc. 1844, March, (Plate XIII, fig. 14, 15.) 

 Testa, ovata, lenui, sardonychia, obsolete fasciatS.; spira vix occulta, pallida; labro subincrassato et 

 reflexo, intus lsevi ; columella albida, sexplicata, plicis superioribus evanidis. 



Inhab. Cape Blanco, west coast of America, in twelve to fifteen fathoms. 



In outline slightly elongated and ovate, thin, of a delicate cornelion, with 

 faint bandings ; the labrum very little thickened and reflexed, of the same colour 

 as the rest of the shell ; aperture equal in length to the shell, the columella sup- 

 porting six folds and of a pale colour ; the superior folds scarcely perceptible. 



Erato. Risso. 



190. Erato vitellina, (Plate XIII, fig. 22, 23.) Testa obeso-ovata, casruleo-rufescente ; spira 

 retusa; labro incrassato, grosse 7-dentato ; columella granulata; apertura inferne dilatata, ad basin 

 effusa. 



Inhab. Bay of Magdalena, California ; in seven fathoms, among sand. 



